This poojai is observed as Sangabishegam on Mondays in the month of Karthikai with the goal of eliminating sin and accumulating prosperity. The moon rules over the ocean. The conch comes from the ocean. Therefore, a special worship is performed by showering Lord Shiva with water poured through divine conches. It is interesting to note that it is Moonday that has become Monday over the ages and Lord Shiva is also extolled as Soman or the Lord of the Moon.